Zero resetting mechanism for reg



ZERO RESETTING MECHANISM FOR REGISTERS Filed June 5, 1935 IN VENTORS:

fiZzrZLacke Rude? Bran/$51562 Patented Feb. 1, 1938 PATENT OFFICE ammo:

ZERO RESETTING MECHANISM FOR REG- ISTEBS Karl Locke and RudolfBrunhnber, Berlin- Tempelhof, Germany Application June 5, 1935, SerialNo. 24,996 In Germany August 2, 1934 14 Claims.

The present invention relates to improvements in zero-resettingmechanism for calculating or adding machines and the like, and moreespecially to calculating and similar machines having a countingmechanism with index-indicator wheels or rollers, arranged with parallelaxes, on the shafts of which wheels or rollers, heartshaped clearingcams are provided which serve to set the counting indicators back tozero, thus to clear the machine.

Hitherto, in resetting mechanism of this kind, the heartshaped clearingcams, and with them, the index-indicator wheels are set back to zero bymeans of a sliding bar, which moves in a longitudinal direction of thecounting mechanism. This method has the disadvantage that the initialresetting means for setting the clearing sliding bar into action, mustbe fixed to the carriage itself, because if attached to the rigidmachine frame, the resetting or clearing operation is possible only whenthe slide is in a terminal position. A further disadvantage of thisknown arrangement is that the resetting or clearing slide has to move acomparatively extended distance and, being heavy, has considerableinertia and thus this load must be accelerated or retarded. This slowsdown operation and renders such an arrangement impracticable formachines with rapid action.

According to the present invention the resetting or clearing cams arenot activated by a Ion-'- gitudinal motion of a bar, or the like, but bymeans of a rotary or oscillatory means set on an axis and locateddiagonally or across to the index wheel shafts. This means, in itspreferred embodiment is in the form of levers, or in the form of sectorarms, keyed to a joint horizontal shaft. The operation of these clearinglevers or sector arms may be accomplished by turning their common shaftby hand, or by means of an operative rod or bar shiftably mounted on themachine frame, which in every tens carry-over position of the addingmechanism carriage stands opposite one of the clearing levers or sectorsand whose function may be caused by direct pressure on an operative keyor by coupling it to a lifter, driven by the motor of the machine.

In the drawing,

Fig. 1 represents a fragmentary cross-section of the counting mechanismcarriage of an adding machine with two counting mechanisms, fitted inaccordance with the new arrangement;

Fig. 2 shows a longitudinal section horizontally taken on line l-| ofFig. 1,1ooking in the direction of the arrows, and

Fig. 3 is a sectional view, taken on the line l3, Fig. 2, looking in thedirection of the arrows.

In both views only such parts of the rigid machine frame are indicatedas is necessary to a clear understanding of the invention, such partsserving for the support of key levers and to guide the operating rods.

The counting means carriage I, Fig. l, is slidably mounted on the rigidmachine frame (not shown) by means of the slide rails 2 and 3. On saidcarriage are mounted two sets or groups of index wheel-shafts 4. Each ofthe index wheelshafts 4 is provided in the known manner with an indexwheel 5, a clearing cam 6, a tens carryover lever I and a pinion 8, andeach index wheel-shaft 4 is pivoted at its opposite ends 9 in thecarriage plates 9' and 5".

Along each group of the index wheel-shafts 4 and mounted transversely tosaid shafts is mounted within the counting means carriage a rockableclearing shaft I0, and on each of these shafts are fixed a plurality ofspaced sectorshaped clearing levers II, respectively cooperative withthe clearing cams 6 to restore the index wheels to zero position, whenthe levers II are operated.

The sector-shaped levers ll may be simultaneously operated by thereciprocation of the clearing bars l3 and H, as will be explained below;and they may also be operated by manipulating a wing shaped lever 28,shown in dotted lines at the right of Fig. 2, which wing lever is fixedto one end of each of the shafts l0, so that the levers H, may also bemoved to restore cams 6 to their zero position, by an oscillation ofshaft i0, through manipulation of the wing lever 28.

Near the handle 28, the shaft l carries fast thereon an arm 29, having ahooked outer end movable in an arcuate recess on the edge of the bearingplate 30. This hooked end is yieldably pressed into engagement with astop face 21 of the plate 30 by means of a coil spring 26, on the shaft,having one end secured to the machine frame and the other engagedagainst the arm 29, thereby pressing the hooked end against the stopface 21 thereby yieldably holding the shaft in and levers H in theirnormal inactive position. The plate 30 also serves as a bearing for theshaft III.

Slidably mounted in the machine frame are clearing bars I! and I4operative in substantially a vertical direction. At the upper end ofeach of the bars li -l4 is a roller l which strikes whichever clearingsector II is above it, when the bar is lifted for clearing. Theoperation of the bar I3 is done by means of a key-lever H, which ispivoted at l6 to the machine frame. The key-lever has at one end a key18, while the other end is connected by a pivot IS with the clearing barl3. In this way the pressure on key l8 effects the clearing.

In case the back-to-zero cancellation is to be effected by a motordriven means, then, as indicated in Fig. 1 for the clearing bar It, thekey 20 carried on key lever 2|, pivoted at 22, is connected to push-rod23, the other end of which is connected to rod H, by means of a slottedopening connection 24 and a trunnion 24. By pressureon the key 20, thepush rod 23 gets into the path of an operative extension 25a of arotative cam 25, driven by the motor (not shown) of the machine, thuscausing the lifting of rod l4 and thus operating clearing restoringmeans.

The manner of operating is as follows: The pinion shafts 4 are in randomposition after the adding operation. The clearing shafts I0 with theirappurtenant clearing sectors II are in the starting position, indicatedby full lines Fig. 1, in which position they are held by the stop 21 andthe spring 26. The clearing sectors II are outside of the path of thecircle described by the high points of the clearing cams 6, duringadding operation. When the shafts H! are rotated in the previouslydescribed manner, by lifting the rods I3 and M, the individual sectors lI act on the cancellation cams 6 to rotate them until they touch theflat portions of said cams thus causing their rotative restoration tozero, and leaving them set in the zero position. After clearing, theshafts ID are brought back to the initial, starting position by theirsprings 26. The edges of the clearing levers l I, where they contactwith the clearing cams 6 preferably are sharpened.

It is to be noted that the rotation of the clearing shafts I0 may alsobe done by hand by means of a wing lever 28, Fig. 2, which is movablewith and carried by the carriage.

We claim:

1. The combination in a calculating machine or the like, having acounting mechanism, including a plurality of parallel rotatable shaftshaving indicator wheels fixed thereon, comprising clearing cams on saidshafts, and clearing means rockable about an axis adjacent andsubstantially transverse to the axis of said shafts and adapted toengage said clearing cams to restore said indicator wheels to theirinitial position.

2. The combination in a calculating machine or the like having acounting mechanism, including a plurality of parallel rotatable shaftshaving indicator wheels fixed thereon, comprising clearing cams on saidshafts and clearing means rockable about an axis located transverse tothe axis of said shafts and adapted by engaging said clearing cams torestore said indicator wheels to their initial position, said clearingmeans comprising a clearing shaft having mounted thereon a number offixed clearing arms equal in number to the number of said clearing cams,each of said clearing arms being adapted to engage a related one of saidclearing cams.

3. The combination in a calculating machine or the like, having acounting mechanism including a plurality of parallel rotatable, spacedshafts having indicator wheels fixed thereon, comprising clearing camsfixed on said shafts, and spaced clearing means rockable about an axisadjacent and substantially transverse to the axis of said shafts, saidclearing means comprising a clearing shaft having fixed thereto a numberof clearing arms equal in number to the number of said clearing cams,said clearing arms being adapted to engage said clearing camsrespectively, means for rocking said clearing shaft in one direction,and means on said clearing shaft for automatically restoring saidclearing shaft in the opposite direction.

4. The combination in a calculating machine or the like, having acounting mechanism, including a plurality of parallel rotatable shaftshaving indicator wheels fixed thereon, comprising clearing cams fixed tosaid indicator wheelshafts, a clearing shaft operatively mountedtransverse to the axis of said indicator wheelshafts, a plurality ofsector discs rigidly connected to said clearing shaft and adapted tooperatively engage said clearing cams, means to rock and stop saidclearing shaft in one of its directions of rocking, means toautomatically restore and stop said clearing shaft in the oppositedirection of' rocking, said automatic means comprising a movable springactuated lever on said clearing shaft and key levers to move said sectordiscs.

5. In a calculating machine, a plurality of indicator-shafts each havinga clearing cam thereon, the combination of a clearing shaft mounted forpartial rotation; light weight thin clearing levers mounted fast on saidclearing shaft, one for each indicator and each adapted, when the shaftis rocked slightly, to engage the associated clearing cam for restoringthe indicator; the mass-acceleration of said shaft and levers beingslight during rapid operation and requiring relatively small power.

6. In a machine comprising a frame, a carriage slidable thereon, andindicators on the carriage, the combination of means mounted on thecarriage for restoring all of said indicators, said means includingmotive members traveling with the carriage when the latter travels; andoperating means movably mounted on the frame and adapted to cooperatewith one of said motive members at each of several positions of thecarriage in its travel.

7. In a calculating machine comprising a nontraveling frame, a carriageslidable thereon and indicators in the carriage, the combination ofmeans mounted on the carriage for restoring all of said indicators, saidmeans including motive members spaced along the carriage; andnontraveling operating means movably mounted on the frame for movementperpendicular to the path of the carriage, and adapted to cooperate withone of said motive members whenever the carriage is in one of severalpositions.

8. In a calculating machine comprising a nontraveling frame, a carriageslidable thereon and indicators in the carriage, the combination ofmeans mounted on the carriage for restoring all of said indicators, saidmeans including motive members; and operating means movably mounted onthe frame and adapted to cooperate with one of said motive members ineach of several positions of the carriage, and adapted to operate therestoring means without danger of moving the carriage and interferingwith the operation of the machine.

9. In a calculating machinejcomprising a machine frame, a carriageslidable thereon, a pinrality of indicator-shafts each having a clearingcam thereon, the combination of a clearing shaft mounted on saidcarriage; clearing levers mounted fast on said clearing shaft, one foreach indicator and each adapted, when the shaft is rocked, to engage theassociated clearing cam for restoring the indicator; and a clearing barmounted in the frame for movement toward an adjacent clearing lever andengageable with one of the clearing levers in each of several positionsof the carriage.

10. In a calculating machine comprising a machine frame, a carriageslidable thereon, a plurality of indicator-shafts each having a clearingcam thereon, the combination of a clearing shaft mounted on saidcarriage parallel to the path of the carriage, and mounted on thecarriage for partial rotation; clearing levers spaced along and mountedfast on said clearing shaft, one for each indicator and each adapted,when the shaft is rocked, to engage the associated clearing cam forrestoring the indicator; a clearing bar slidably mounted in the framefor movement toward an adjacent clearing lever and having its upper endpositioned to be engageable with one of the clearing levers onlywhenever the carriage is in one of several positions; and an operatinglever engaging said bar for operating the same.

11. In a calculating machine comprising a machine frame, a carriageslidable thereon, a plurality of upright indicator-shafts each having aheart-shaped clearing cam thereon, the com-. bination of a clearingshaft mounted on said carriage parallel to the path of the carriage andmovable with the carriage when the carriage moves, and mounted on thecarriage for partial rotation; sector-shaped clearing levers mountedfast on said clearing shaft, one for each indicator and each adapted,when the shaft is rocked, to engage the associated clearing cam forrestoring the indicator; a clearing bar slidably mountedin the frame formovement, toward an adjacent clearing lever and having a roller on itsupper end engageable with one of the clearing levers whenever thecarriage is in one of several positions; an operating lever engagingsaid bar for operating the same; an operating cam; and

means for engaging the operating lever with the cam to operate suchlever.

12. In a calculating machine, indicators; clearing means for restoringall of said indicators, said means including a motive member; a clearingbar slidably mounted for movement toward the motive member and havingits upper end engageable with the motive member; an operating leverengaging said bar for operating the same; an operating cam; and meansfor engaging operating lever with the cm to operate the operating lever.

13. A device for simultaneously restoring the indicators of a machinehaving a plurality of indicator-shafts each having a clearing camthereon, said device comprising a clearing shaft mounted for partialrotation; light weight clearing levers mounted fast on said clearingshaft, one for each indicator and each having its outer active endadapted, when the shaft is rocked slightly, to engage an associatedclearing cam for restoring the indicator whereby all the indicators aresimultaneously restored; the center of gravity of said levers movingonly about half the distance of the movement of the active end, wherebythe mass-acceleration of said shaft and levers is slight during rapidoperation, requiring relatively small power.

14. A non-traveling device for simultaneously restoring the indicatorsof a machine comprising a stationary frame, a carriage slidable thereon,and a plurality of indicators on the carriage, said device comprisingmeans adapted to be mounted on the carriage for simultaneously.restoring all of said indicators, said means including motive membersadapted to travel with the carriage when the latter travels; andnon-traveling operating means adapted to be movably mounted on the frameand adapted to cooperate with one of said motive members at differentpositions of the carriage in its travel.

KARL LOCKE. RUDOLF BRUNHUBER.

